Differential pulley



(No Model.) 3 Sheets-Sheet 1.

E. D. GLEASON DIFFERENTIAL PULLBY.

No.514,888. Patented Feb. 13, 1894.

(No Model.) a sheets sheet 2.

E. D. GLEASON. DIFFERENTIAL PULLBY.

No. 514,888.- Patented Feb. 13. 1894.

WLt'IIQSQ QS Invefiftor (No Model.) Y 3 Sheets-Sheet 3.

" -E. D. GLEASON.

' i DIFFERENTIAL PULLBY. I 7

No. 514,888. Patented Feb. 13,1894.

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EDWARD D. GLEASON, OF PHILADELPHIA, PENNSYLVANIA.

DlFFE RENTlAL PU LLEY.

SPECIFICATION forming part of Letters Patent No. 514,888, dated February13, 1894. v

' Application filed May 4, 1893. Serial No. 472,972. (No model.)

T0 00% whom it may concern:

Beit known that I, EDWARD D. GLEASON, a citizen of the United StatesofAmerica, residing at Philadelphia, in the county of Philadelphia andState of Pennsylvania, have invented certain new and useful Improvementsin Portable Hoists, of which the following is a specification, referencebeing had therein to the accompanying drawings.

My invention has reference 'to hoists and consists of certain featuresfully set forth in the following specification and the accompanyingdrawings forming part thereof.

My inven tion relates more particularly to a portable hoist.

The obj ectof myinvention is to have a cheap portable mechanism thatwill develop the maximum of power at a minimum of weight and cost, andwhile the cost is low the practical efficiency is in no wise impaired.

It consists, broadly, of a chain or sprocket wheel for supporting theload and held in bearings at either side thereof. One of these bearingsis of greatly enlarged diameter and carries an internal spur gear. Tothe box which carries or supports the bearing is fixed integrally aninternal gear having one less tooth than is carried by the sprocketwheel or the internal gear forming an integral part thereof. Aninterposing and interlocking pinion operates this sprocket wheel in themanner to be described in such away that on every revolution of the saidpinion around the teeth of the fixed spur gear the sprocket wheel willhave a rotary motion equal to the pitch of one tooth of the aforesaidsprocket gear. My power is thus in proportion to the number of teeth inthe said internal gear.

In the drawings like parts are referred to by a letter or figure of asimilar character.

Figure 1 is a side elevation of my machine;

- Fig. 2 an endview thereof, wheel 1 omitted;

Fig. 3 a longitudinal section thereof. Fig. 4

is a plan of the gearing, showing the pinion on its crank. Fig.5 is anend view of the sprocket wheel, showing the' internal spur gearthereof;.Fig. 6 part side elevation and part longitudinal sectionthereof. Fig. 6% is an end View of the bearing for one side of thesprocket wheel, showing the internal spur gear thereof. Fig. 7 is partside elevation and part longitudinal section of Fig. 6 Fig.- 8 is a planof the cap. Fig. 9 is a section on line 1-2 Fig. 8.

4 is a bearing for the shaft S and indiper side it is provided with alug 4 and on its lower side with a lug 4 4 is also a hearing. Thisbearing is provided on its lower side with a lug 4" and on its upperside with a lug 4 Fig. 1. The arm2 connects the bearings aforesaid attheir upper sides, being so held by the bolts B, B. To this arm issecured the supporting hook 3. These bolts must be made of a strengthsufficient to bear the entire weight the machine is designed to lift orhold. g

5 is a brace, for holding these bearings in proper relation at theirlower sides. The end 5 thereof is screwed into the bearing at and thebolt end 5' passes through the hole in the projection .4. The nut G isthen applied, holding them firmly together. The bearing 4:, on itsinner-side or face is turned true and smooth. This inner face 4 Fig. 7,being exactly concentric with a center line through the shaft S Theother end of the said bear- .ing also constitutes an internal spur gear.

The pitch line or pitch circumference of the teeth constituting thisinternal gear is also concentric with the. center of the shaft S S is achain or sprocket wheel, which supports directly the-we'ight-to belifted. The specific construction of the chain holding portion of thiswheel is not material to my invention. This wheel is provided on its oneside integrally with aprojecting internal spur gear, without arm andhaving a smooth external circumference or face. This face is in contactor bearing on the internal face of the bearing 4. The external face,therefore, of

the aforesaid integrally spur gear of the rectly for the sprocket wheelS. On its upsprocket, is of the same diameter as the internal face ofthe bearing 4', shown clearly in Fig. 3. When in operation the saidexternal face of the collar 8 and bearing therefor 4' bear the relationto each other respectively of shaft and journal box. tioned braces 2 and5 holding them in their correct positions.

The pitch diameter of the teeth constituting the internal spur gear 8 isthe same as The aforementhe pitch diameter of the teeth constituting theinternal spur on the bearing 4: hereinbefore referred to; but while thepitch diameter of these two internal gears is the same the pitch oftheir respective teeth differs.

In the drawings the internal gear of the bearing 4 has thirty-one teethand the internal gear of the spur S has thirty-two teeth, or one morethan that carried by the aforesaid bearing. (It could however be made tocarry one less and be just as effectual in its work.) The aforementionedsprocket wheel S, at the side opposite to the said internal spur gear 8,has a projecting sleeve bearing 15 also integral with its body. The boreof the bearing 4 is of a proper size to support the sleeve as shown inFig.3, and thus the sprocket wheel S.

S is a shaft. Secured to this shaft at its projecting end is a ropeoperating wheel 1, the said wheel being held to the said shaft by thepin 12, Fig. 3. This shaft, at itsinnerend, has rigidly fixed to it acrank arm 8, Fig. 3.

S is the pivotal stud and S the projecting arm of another crank arm. Thecenter of the stud S and shaft S are on a common line, and the crankarms S and S are of a uniform length. The arm S of the crank iscylindrical and true and it has a hole drilled in its exact center, andthe arm of the crank S has a stud turned on its body of a diameterequalto the diameter of the hole in the arm S The aforesaid stud isfittedinto the hole mentioned and there held by thekey 1 G. A slot beingprovided in the pinion 7 to admit this key. It is now evident that theshaft S the crank arm S the crank arm S and the stud S all practicallyconstitute one piece, which becomes the crank supporting arm for thepinion 7. The sprocket S has its bore annularly enlarged as shown at 10,Fig. 3, thus making a bearing support for the arm S The plate 6, whichsupports the aforementioned stud S, as well as incasing the mechanism,has a similar internal annular enlargement of its bore as shown at 10Fig. 3. The wheel 1 being held by the pin 19 to the shaft S it isevident that when the wheel 1 is rotated the said shaft will also berotated. This wheel 1 is the operating wheel of the machine. Now as thepinion 7 is journaled on said shaft as shown in Figs. 3 and 4 it is ev'ndent it will be carried around on the aforementioned crank as the wheel1 is rotated.

As previously described the internal spur gear 4 has one tooth less thanthe internal spur 8. Now the pinion 7 is of a length equal to the lengthor depth of the teeth of the two aforesaid internal gears combined, andas the two said gears are of like pitch diameter and the teeth of thepinion mesh in the teeth of both internal gears, it follows that 011each revolution of the shaft 8*, the pinion 7 has made one revolution onthe pitch circumference of the aforementioned gears, and has thereforemoved the sprocket wheel a rotary I do not confine myself to the merespecific details of construction as I could make various modificationswithout departing from the spirit of my invention.

Having now described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. In a portable hoist the combination of a weight supporting chain orsprocket wheel provided with an internal spur gear wheel, a cranksupporting shaft, a pinion held on said shaft consisting of a sleevecrank S and stud crank S meshing in said internal spur gear wheel, asupporting case for said sprocket wheel an internal spur gear carried bysaid case; the pitch circumference of the aforesaid two spur gears beingequal but the latter havingone less gear tooth than the former, andwhereby when the pinion is rotated around the fixed spur held by thesupporting case for the aforesaid sprocket spur, the said sprocket spurand the sprocket will be rotated an angular distance equal to the pitchof one of the teeth of the said sprocket wheel, and the load will belikewise moved an equivalent distance.

2. The combination in a portable hoist of a chain or sprocket wheelprovided with an enlarged hole 10 at the inner side thereof, an internalspur gear wheel carried by said sprocket wheel, a supporting case forthe sprocket wheel also provided with an internal spur gear, a sleevecrank S, a stud crank S a pinion supported by said cranks and asupporting plate 6 also provided with an enlarged internal hole or bore10 substantially as described for the purpose set forth.

3. The combination in a portable hoist of an operating rope wheel,aweight supporting chain or sprocket wheel, a common supporting shaft forsaid wheels provided with a crank at one end said crank consisting of asleeve crank S and astud crank S thereof and at the other end to whichis secured the aforesaid rope wheel, a pinion carried by said crank,supporting bearings for said shaft, an internal spur gear fixed to saidsprocket wheel and an internal spur gear fixed to the crank supportingend of said shaft, the two spur gears aforesaid having a like pitchcircumference but having a difference of one tooth, whereby on eachrevolution of the operating or rope wheel the weight supporting chain orsprocket wheel will be rotated a distance equal to the pitch of one ofthe teeth of the internal spur fixed thereto.

In testimony whereof I affix mysignature in presence of two witnesses.

EDWARD D. GLEASON. Witnesses:

JOSHUA R. MORGAN, CHARLES ENGLE.

